From mboxrd@z Thu Jan 1 00:00:00 1970 From: Colin McCabe Subject: Re: unreadable drives can be synchronized? Date: Fri, 18 May 2007 14:10:50 -0400 Message-ID: <464DEC2A.6040209@gmail.com> References: <200705181447.l4IElO2a000640@cichlid.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <200705181447.l4IElO2a000640@cichlid.com> Sender: linux-raid-owner@vger.kernel.org Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids Andrew Burgess wrote: >> Basically, B appears to be "write-only"; it will never return an error on a >> write, but just try to read from it, and you will be sorry. > > It would be interesting to see what SMART says about drive B, especially > the short and long self tests. > > - > To unsubscribe from this list: send the line "unsubscribe linux-raid" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > On my hard drives, automatic online testing is turned on, and so is automatic offline testing. I run the long self-test once a week. I have two drives which can play the role of B. One of them has this SMART output: [root@cmccabe-devel root]# smartctl -d ata /dev/sdb -H smartctl version 5.36 [i686-pc-linux-gnu] Copyright (C) 2002-6 Bruce Allen Home page is http://smartmontools.sourceforge.net/ === START OF READ SMART DATA SECTION === SMART overall-health self-assessment test result: FAILED! Drive failure expected in less than 24 hours. SAVE ALL DATA. Failed Attributes: ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED WHEN_FAILED RAW_VALUE 5 Reallocated_Sector_Ct 0x0033 004 004 024 Pre-fail Always FAILING_NOW 133273031255 The other one passes SMART. Both of them eat data, though. Colin